I don't think money's the issue. If it were, GW could always have settled by now - I have a hard time imagining CHS being so sure of its merits as to not accept a settlement. To my mind, GW is acting like it wants to hammer the third-party bits industry (or at least upgrade the hammer it has available), and the only way to do that is to carry a lawsuit through.
Does anybody have a link to the Second Revised Copyright Claim Chart? Be interested to know what GW was trying to withdraw, and whether it's significant that the court didn't allow them to do so without prejudice.